Say the human voice has a maximum of 4000 Hz when talking. You would have to sample at aout 4 x4000Hz to ensure each wave can be accurately recorded. If you sample at a lower frequency, you may find your recorder sampling only the peaks of a wave, which would then look like DC.

Wouldnt you have to do something else such as convert it to a changeing voltage rather than a changeing amp for the adc to read it properly. Usually microphones emit an wave which is interpreted electronically as a change in the amps, the voltage level remains the same. When you amplify you usually increase the voltage level and the amps wave increases in proportion.

If you don't care about the sound only the sound level you might be able to feed it into a capacitor and read the overall voltage stored there. I'm doing this on the fly at work so it might sound crazy after I think about it some more But the louder the sound into the mic the larger the RMS voltage will be if you filter that with a cap it might give you a rough estimate of the volume. If you sample from 2 different mics you might get a false positive because the second mic will read the voltage at a different time and might get the falling edge of the signal even though it had a larger peak. Ok now back to making wiring adapters for clocks. I can't wait till I grow up to be a real engineer. 5 more months!

Say the human voice has a maximum of 4000 Hz when talking. You would have to sample at aout 4 x4000Hz to ensure each wave can be accurately recorded. If you sample at a lower frequency, you may find your recorder sampling only the peaks of a wave, which would then look like DC.

The human voice contains formants important for distinguishing certain sounds of up to slightly above 6kHz.

To sample a frequency reliable, you need to sample at least twice that frequency (Nyquists theorem).

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Regards,Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?Please remember...Engineering is based on numbers - not adjectives

That is what could happen at the Nyquist frequency (highly theoretical though, since no circuit has a frequency deviation of exactly zero.If your sample speed is a bit too low, you would get false readings (the input would appear to be of a lower frequency), but as long as your sample speed is just a wee bit higher than twice your signal frequency, you're in the green.CD audio sample speed is 44.1 kHz and the signal can go to 20kHz - does your CD's sound bad? (Not talking music taste here of course )

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Regards,Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?Please remember...Engineering is based on numbers - not adjectives